1. Department of Nuclear Medicine; Changhai Hospital of Shanghai, Shanghai 200433, P.R. China
2. Geriatric Department, China‑Japan Union Hospital of Jilin University, Changchun, Jilin 130033, P.R. China
3. Science Research Center, China‑Japan Union Hospital of Jilin University, Changchun, Jilin 13003, P.R. China
4. Henan Medical Key Laboratory of Molecular Imaging, Nuclear Medicine Department, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450000, P.R. China